Evaluation of Harmful Effect of Impurities in Zn Electrowinning Solution by Cyclic Voltammetry

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  • サイクリックボルタンメトリーによる亜鉛電解採取液の不純物の悪影響評価
  • サイクリック ボルタンメトリー ニ ヨル アエン デンカイ サイシュエキ ノ フジュンブツ ノ アクエイキョウ ヒョウカ

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Abstract

The harmful effect of impurities on the electrowinning of Zn was evaluated by a cyclic voltammetry. The voltammograms obtained from the solutions containing Cu, Ni and Sb as impurities showed a shift of hydrogen evolution potential to the noble direction and an increase in critical current density for Zn deposition. When the potential of working electrode in the voltammetry was turned back to the noble direction after Zn deposition, the deposited Zn dissolved. The potential required for initiating the dissolution of Zn was somewhat more noble in solutions containing Cu and Ni than in impurity-free solution. In solutions containing Cu and Ni, the further shift of potential to the noble direction after dissolution of Zn brought about the abrupt shift of current density to reduction side for hydrogen evolution. This is attributed to Cu and Ni with low hydrogen overpotential deposited on electrode, and showing that the voltammogram can indicate whether the impurity deposits or not. It could be concluded that the harmful effect of impurities on the electrowinning of Zn can be evaluated by the cyclic voltammetry.

Journal

  • Journal of MMIJ

    Journal of MMIJ 127 (6_7), 267-271, 2011

    The Mining and Materials Processing Institute of Japan

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